C1290

DTC C1290: CAN time-out error

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines CAN Bus Line Diagnostics Flow ).
- If the diagnostic trouble code No.C1290 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble code is not highly reliable.
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to Testing and Inspection , Testing and Inspection and Testing and Inspection ).
- When the diagnostic trouble code No.C1290 is set in ASC-ECU, the diagnostic trouble code for another system may also be set. When the diagnostic trouble code for another system is set, carry out diagnosis for that system first.

CIRCUIT OPERATION

ASC-ECU receives signals necessary for the operations of ABS or ASC from the engine control module, TCM, AWD-ECU, ETACS-ECU, and the steering wheel sensor via the CAN bus lines.

DTC SET CONDITIONS

ASC-ECU receives signals necessary for the operations of ABS or ASC from the engine control module, TCM, AWD-ECU, ETACS-ECU, and steering wheel sensor via CAN bus lines. This diagnostic trouble code is stored when ASC-ECU cannot receive the signals necessary for the operations of ABS or ASC from the engine control module, TCM, AWD-ECU, ETACS-ECU, and steering wheel sensor.

PROBABLE CAUSES

- Engine control module malfunction
- TCM malfunction
- AWD-ECU malfunction
- Steering wheel sensor malfunction
- CAN bus malfunction
- ASC-ECU malfunction
- ETACS-ECU malfunction
- ETACS-ECUs have been interchanged between two vehicles.
- Connector disconnected or improperly connected
- Stretched or broken wires

DIAGNOSIS

STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.

Use scan tool to diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines CAN Bus Diagnostics Chart).
On completion, go to Step 4.
STEP 2. Using scan tool MB991958, diagnostic trouble code

Check that the diagnostic trouble codes U0100, U0101, U0114, U0126, and U0141 are set in ASC-ECU.

Q. Is any DTC set?

YES Troubleshoot for the relevant diagnostic trouble code (Refer to Active Stability Control System (ASC)).
NO Go to Step 3.
STEP 3. Using scan tool MB991958, other system diagnostic trouble code

Using scan tool, check if the diagnostic trouble codes are set from the engine control module, TCM, AWD-ECU and ETACS-ECU or not.

Q. Is any DTC set?

YES Troubleshoot the relevant diagnostic trouble code, and then go to Step 4.
NO Go to Step 4.
STEP 4. Connector check: ASC-ECU connector

Q. Is the check result normal?

YES Go to Step 5.
NO Repair the defective connector. Then go to Step 5.
STEP 5. ETACS-ECU coding data check

Programming and Relearning.

Q. Is the check result normal?

YES Go to Step 6.
NO Replace the ETACS-ECU Electronic Time and Alarm Control System (ETACS)-ECU Removal and Installation), and then go to Step 7.
STEP 6. Check whether the diagnostic trouble code is reset.

Erase the DTC.

Q. Is DTC C1290 set?

YES Replace the hydraulic unit (integrated with ASC-ECU). Then go to Step 7.
NO If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected How to Cope With Intermittent Malfunctions).
STEP 7. Check whether the diagnostic trouble code is reset.

Erase the DTC.

Q. Is DTC C1290 set?

YES Return to Step 1.
NO The procedure is complete.